单项选择题

That ______ the case, we have to make some changes in our plan.

A．is
B．was
C．being
D．has been
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单项选择题
Tom Stephen gripped the ______ wheel hard as the car bounced up and down.
A．stirring
B．driving
C．steering
D．receiving
单项选择题
Since I could not see anything through the microscope, ______ my careful adjustment, I gave up.
A．for all
B．above all
C．after all
D．in all
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